Fuel supply device

ABSTRACT

A fuel supply device is obtained in which joint strength can be maintained in a joint portion of plural filter members configuring a fuel filter. A fuel filter ( 16 ) with an overall bag shape is configured by welding together an upper face filter cloth ( 16 U) a lower face filter cloth ( 16 L) of the fuel filter ( 16 ) at a welded portion ( 16 C). A sub tank upper side member ( 15 U) and a sub tank lower side member ( 15 L) nip the upper face filter cloth ( 16 U) and the lower face filter cloth ( 16 L) at a nipping position NP that is at a different position from the welded portion ( 16 C).

TECHNICAL FIELD

The present invention relates to a fuel supply device, and morespecifically, relates to a fuel supply device that supplies fuel frominside a fuel tank to an engine, or the like.

BACKGROUND ART

In fuel supply devices that supply fuel inside a fuel tank to anexternal device such as an engine, fuel supply devices exist that areprovided with a fuel filter inside a fuel tank body, and that feed outfuel, from which the fuel filter has removed foreign matter, to theexterior of the fuel tank body. For example, Japanese Patent ApplicationLaid-Open (JP-A) No. H6-317286 describes a fuel filter device with aninternal space configured between a first member and a second member,and with a filter member interposed between the first member and thesecond member.

However, in the structure of the filter described in Patent Document 1,since the filter members are not in close contact with each other, thereis a concern that an oil membrane could break, and gas could flow intothe space between the filter members, when for example an upper sidefilter member is no longer in contact with the fuel. Simply joiningtogether the plural filter members may be considered in order tosuppress this eventuality, however since external forces sometimes acton the joint portion through the first member and/or the second member,it is desirable to maintain the strength of the joint.

SUMMARY OF INVENTION Technical Problem

In consideration of the above circumstances, an object of the presentinvention is to obtain a fuel supply device capable of maintaining thejoint strength of a joint portion between plural filter membersconfiguring a fuel filter.

Solution to Problem

A fuel supply device of a first aspect of the present inventionincludes: a fuel tank body that stores fuel; a fuel filter that isprovided inside the fuel tank body and formed in an overall bag shapewith plural sheets of filter members superimposed on each other andjoined together by a joint portion so as to permit passage of the fueland restrict the passage of foreign matter in the fuel; a nipping memberthat nips the plurality of sheets of filter members at a nippingposition that is a different position from the joint portion; aseparation maintaining member that is disposed between the plurality ofsheets of filter members and that maintains a separation between thefilter members; and a feed-out means that feeds out fuel from inside thefuel filter to the fuel tank body exterior.

In this fuel supply device, the bag shaped fuel filter is configured bysuperimposing and joining together the plural sheets of filter memberswith the joint portion. Since the plural sheets of filter members are inclose contact with each other at the joint portion, even when any one ofthe filter members stops being in contact with the fuel, an oil membranecan be maintained on a filter member as long as another of the filtermembers is in contact with the fuel, suppressing gas from flowing insidethe fuel filter.

The separation maintaining member disposed between the filter membersmaintains the separation between the filter members (a gap between thefilter members). Foreign matter in the fuel is removed as the fuelpasses through the filter members and flows inside the fuel filter. Thefuel inside the fuel filter is then fed out externally by the feed-outmeans.

The plural sheets of filter members are nipped at the nipping positionby the nipping member. The shape of the filter members (filter member)can be maintained and the strength of the filter members can be secured,and moreover the filter members can be attached to the fuel tank body,due to employing the nipping member.

The nipping position of the nipping member is at a different positionfrom the joint portion. Accordingly, external forces do not act on thejoint portion even when external forces act on the filter membersthrough the nipping member. The joint strength of the joint portion canaccordingly be maintained.

A fuel supply device of a second aspect of the present invention is thefuel supply device of the first aspect, wherein: the fuel filter isformed in a flattened bag shape by employing the plural sheets of filtermembers disposed from top to bottom, and joining the plural sheets offilter members together with the joint portion set at an outerperipheral portion of the filter members; and the nipping member nipsthe plural sheets of filter members in an up-down direction at thenipping position.

Due to employing the plural sheets of filter members disposed from topto bottom with the joint portion set at the outer peripheral portion ofthe filter members, the bag shaped fuel filter can be configured with asimple structure. Since the filter member has a flattened bag shape, thefilter member can be disposed for example along the bottom face of thefuel tank body.

The nipping member nips the plural sheets of filter members in theup-down direction at the nipping position. Namely, the plural sheets offilter members can be reliably nipped along the superimposing direction.

A fuel supply device of a third aspect of the present invention is thefuel supply device of the second aspect, wherein: the separationmaintaining member is disposed so as to maintain the separation betweenthe plural sheets of filter members in the up-down direction

The separation maintaining member enables the separation between theplural sheets of filter members to be reliably positioned in the up-downdirection.

A fuel supply device of a fourth aspect of the present invention is thefuel supply device the fuel supply device of any one of the first aspectto the third aspect, wherein: the joint portion and the nipping positionare adjacent to each other as viewed along the superimposing directionof the plural sheets of filter members.

Due to the joint portion and the nipping position being adjacent to eachother in this way, even when fuel attempts to move to the outside of thefuel filter through the filter members at portions configuring the jointportion, such movement can be suppressed at the nipping position.

A fuel supply device of a fifth aspect of the present invention is thefuel supply device of any one of the first aspect to the fourth aspect,wherein: the nipping position is positioned to an inner side of thejoint portion.

Note that “inner side” here refers to the inner side as viewed along thesuperimposing direction of the filter members (the far side relative tothe outer peripheral portion of the filter members).

Namely, the nipping position is further to the inner side than the jointportion. Accordingly, even when force acts on the plural sheets offilter members in a direction to move the plural sheets of filtermembers apart from each other further to the inner side than the nippingposition, this force does not act on the joint portion. The jointstrength of the joint portion can accordingly be maintained.

A fuel supply device of a sixth aspect of the present invention is thefuel supply device of any one of the first aspect to the fourth aspect,wherein: the joint portion is positioned to an inner side of the nippingposition.

Namely, the nipping position is further to the outer side than the jointportion. Accordingly, even when an external force acts further to theouter side than the nipping position, this external force does not acton the joint portion. The joint strength of the joint portion canaccordingly be maintained.

A fuel supply device of a seventh aspect of the present invention is thefuel supply device of any one of the first aspect to the sixth aspect,wherein: the nipping member includes: two nipping tabs that arerotatably coupled to each other by a hinge portion; and a nippingmaintaining member that maintains a nipping state of the plurality ofsheets of filter members by the two nipping tabs.

The 2 nipping tabs can accordingly be rotated to nip the plural filtermembers, and the nipped state can be maintained by the nippingmaintaining member.

Since the 2 nipping tabs are coupled together by the hinge, the numberof components is reduced compared to a configuration in which the 2nipping tabs are configured by separate bodies, and integral molding ofthe nipping tabs also becomes possible. Moreover, due to integratingtogether a portion of the nipping tabs, an assembly operation of the 2nipping tabs, and a nipping operation of the filter members, can be madesimpler.

Advantageous Effects of Invention

Due to the configuration described above, the present invention enablesthe joint strength of the joint portion of the plural filter membersconfiguring the fuel filter to be maintained.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a cross-section illustrating a fuel supply device of a firstexemplary embodiment of the present invention in a state in which thereis plentiful fuel inside a fuel tank body.

FIG. 2 is a cross-section illustrating a sub tank configuring a fuelsupply device of the first exemplary embodiment of the presentinvention.

FIG. 3 is an enlarged cross-section illustrating a portion of a fuelsupply device of the first exemplary embodiment of the presentinvention.

FIG. 4 is a cross-section illustrating a fuel supply device of the firstexemplary embodiment of the present invention in a state in which fuelinside a fuel tank body has been depleted.

FIG. 5 is a cross-section illustrating a fuel supply device of the firstexemplary embodiment of the present invention, in which fuel inside afuel tank body and a sub tank is in a tilted state.

FIG. 6 is an enlarged cross-section illustrating a portion of a fuelsupply device of a modified example of the first exemplary embodiment ofthe present invention.

FIG. 7 is a cross-section illustrating a sub tank configuring a fuelsupply device of a second exemplary embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

FIG. 1 illustrates a schematic configuration of a fuel supply device 12of a first exemplary embodiment of the present invention. The fuelsupply device 12 includes a fuel tank body 14 in which fuel is stored.The fuel tank body 14 is for example configured in a substantially boxshape, and a sub tank 15 that includes a fuel filter 16 and a storagemember 18 as illustrated in FIG. 2 is disposed inside the fuel tank body14.

The fuel filter 16 includes plural sheets of filter cloths (in thepresent exemplary embodiment, two filter cloths of an upper face filtercloth 16U and a lower face filter cloth 16L) disposed from top tobottom. In the present exemplary embodiment, a welded portion 16Cserving as an example of a joint portion of the present invention is setat outer peripheral portions of the upper face filter cloth 16U and thelower face filter cloth 16L respectively. The upper face filter cloth16U and the lower face filter cloth 16L are partially superimposed oneach other and welded together at the welded portion 16C. A spacingmember 52 is disposed between the upper face filter cloth 16U and thelower face filter cloth 16L. The fuel filter 16 is accordinglyconfigured with a flattened bag shape (with a closed curved face shape)overall, with a space in which fuel is housed configured between theupper face filter cloth 16U and the lower face filter cloth 16L.

The upper face filter cloth 16U and the lower face filter cloth 16Lallow fuel to pass from the outside to the inside of the bag shaped fuelfilter 16. Foreign matter is removed from the fuel by restricting thepassage of foreign matter in the fuel as the fuel passes from theoutside to the inside of the bag shaped fuel filter 16. The inside ofthe fuel filter 16A is configured from a material that acts to preventthe inflow of foreign matter (such as from a woven fabric, a nonwovenfabric, a porous resin or a mesh shaped member). The upper face filtercloth 16U and the lower face filter cloth 16L are formed in the sameshape as each other (this may be for example a polygonal shape such as aquadrilateral shape, a circular shape, or an elliptical shape) in planview (as viewed along the arrow A direction). The fuel filter 16 iscapable of storing in an inside portion fuel that has passed through theupper face filter cloth 16U and the lower face filter cloth 16L. In astate in which at least a portion of the fuel filter 16 is immersed inthe fuel inside the fuel tank body 14, an oil membrane LM of the fuel isformed and maintained on the surface of the fuel filter 16.

The fuel filter 16 (in particular, the lower face filter cloth 16L) isdisposed substantially parallel to a bottom face 14B of the fuel tankbody 14, with a gap configured between the fuel filter 16 and the bottomface 14B. Fuel is able to flow inside the fuel filter 16 through thisgap, as illustrated by the arrow F1 in FIG. 1.

As illustrated in FIG. 3, the upper face filter cloth 16U and the lowerface filter cloth 16L are configured by different materials. Inparticular, the materials for the filter cloths are selected such thatthe pressure loss of the upper face filter cloth 16U is greater than thepressure loss of the lower face filter cloth 16L. “Pressure loss” refersto the difference in pressure between pressure prior to passage andpressure after passage when the fuel passes through the upper facefilter cloth 16U or the lower face filter cloth 16L (for example when afuel pump body 42, described later, is being driven). Fuel canaccordingly be made to pass relatively readily through the lower facefilter cloth 16L compared to the upper face filter cloth 16U. In thepresent exemplary embodiment, a structure is adopted wherein the upperface filter cloth 16U has a smaller total surface area of gaps in anonwoven fabric than the lower face filter cloth 16L in order to providethis difference in pressure loss.

The spacing member 52 between the upper face filter cloth 16U and thelower face filter cloth 16L includes plural sideways framework strips56A disposed parallel to each other in the horizontal direction, andplural lengthways framework strips 56B disposed parallel to each otherin the horizontal direction so as to intersect orthogonally with thesideways framework strips 56A. The framework strips are disposed betweenthe upper face filter cloth 16U and the lower face filter cloth 16L,such that the upper face filter cloth 16U and the lower face filtercloth 16L do not contact each other in the up-down direction at theportions where the framework strips are present, thereby configuring thespace for storing the fuel.

The sub tank 15 includes a sub tank upper side member 15U positioned tothe upper side of the fuel filter 16, and a sub tank lower side member15L positioned to the lower side of the fuel filter 16. Both the subtank upper side member 15U and the sub tank lower side member 15L serveas examples of “nipping tabs” of the present invention.

The sub tank upper side member 15U includes a vertical wall portion 20that is positioned to the periphery of the fuel filter 16 in plan view(as viewed along the arrow A direction). The vertical wall portion 20 isfor example formed in a flattened cylinder shape. A lid plate portion 22extends from an upper edge of the vertical wall portion 20 in adirection approaching a fuel suction tube 44A, described later (adirection approaching the center as seen in plan view).

As seen in plan view, an upper side nipping wall 30U projects downwardsfrom the lid plate portion 22 to the inside of the vertical wall portion20. The upper side nipping wall 30U is positioned adjacent to the weldedportion 16C to an inner side of the welded portion 16C as seen in planview. As will be described later, the upper face filter cloth 16U andthe lower face filter cloth 16L are nipped in the up-down directionbetween the upper side nipping wall 30U and a lower side nipping wall30L.

In the present exemplary embodiment, the storage member 18 is configuredby the upper side nipping wall 30U, the lid plate portion 22 to theinside of the upper side nipping wall 30U, and the upper face filtercloth 16U of the fuel filter 16. In other words, at least a portion (theentirety in the example illustrated in FIG. 2) of a bottom portion ofthe storage member 18 is configured by the upper face filter cloth 16U.The storage member 18 is capable of storing fuel above the fuel filter16.

An inflow hole 24 is formed penetrating the lid plate portion 22 in thethickness direction at a substantially central portion of the lid plateportion 22. The fuel suction tube 44A is inserted through the center ofthe inflow hole 24. The inner diameter of the inflow hole 24 isconfigured larger than the outer diameter of the fuel suction tube 44A.The hole edge of the inflow hole 24 does not make contact with the fuelsuction tube 44A, and as illustrated by the arrow F3, fuel is able toflow inside the storage member 18 through a gap 28 formed therebetween.Since the inflow hole 24 doubles as an insertion through hole forinsertion of the fuel suction tube 44A, there is no need to form anadditional insertion through hole for this purpose, achieving asimplification in structure.

The sub tank lower side member 15L includes a bottom plate portion 46below the lower face filter cloth 16L. Plural insertion through holes 48are formed penetrating the bottom plate portion 46 in the thicknessdirection. As shown by the arrow F1, fuel GS inside the fuel tank body14 is able to flow inside the fuel filter 16 through the insertionthrough holes 48.

The flattened circular cylinder shape lower side nipping wall 30Lprojects up from the periphery of the bottom plate portion 46. The lowerside nipping wall 30L configures a nipping member of the presentinvention. The upper face filter cloth 16U and the lower face filtercloth 16L are nipped between the lower side nipping wall 30L and theupper side nipping wall 30U in the superimposing direction of the upperface filter cloth 16U and the lower face filter cloth 16L (in theup-down direction).

As illustrated in FIG. 3, a nipping position of the upper face filtercloth 16U and the lower face filter cloth 16L between the upper sidenipping wall 30U and the lower side nipping wall 30L (a nipping positionNP) is at a different position from the welded portion 16C, and ismoreover set at a position adjacent to the welded portion 16C as seen inplan view (as viewed along the superimposing direction). In particular,in the present exemplary embodiment the nipping position NP ispositioned to an inner side of the welded portion 16C in plan view.

Due to nipping the fuel filter 16 with the sub tank upper side member15U and the sub tank lower side member 15L in this manner, the shape ofthe fuel filter 16 is maintained and the strength of the fuel filter 16is secured. The fuel filter 16 can moreover be stably disposed at aspecific position (a position along the bottom face 14B) inside the fueltank body 14.

An outer ring portion 50 is formed from the lower side nipping wall 30Ltowards the outside in plan view. The outer ring portion 50 isconfigured in a ring shape, and is configured with a shape that entersto the inside of the vertical wall portion 20 of the sub tank upper sidemember 15U. Plural engagement cylinders 58 project upwards from specificpositions on the outer ring portion 50. Engagement tabs 60 project outfrom the engagement cylinders 58. The engagement tabs 60 engage withengagement holes 62 formed in the vertical wall portion 20 (for exampleby what is referred to as snap-fitting), thereby attaching the sub tanklower side member 15L to the sub tank upper side member 15U at specificattachment positions.

Moreover, in the present exemplary embodiment, outer peripheral portionsof the fuel filter 16 (portions to the outside of the fuel filter 16)make contact with inner peripheral faces of the engagement cylinders 58.The fuel filter 16 is accordingly positioned with respect to the subtank 15.

As illustrated in FIG. 1 and FIG. 2, a fuel pump module 32 is providedabove the storage member 18. The fuel pump module 32 includes the fuelpump body 42. In the present exemplary embodiment, the fuel pump body 42is supported over the sub tank 15 by a bracket 42B.

The fuel suction tube 44A extends downwards from one side face of thefuel pump body 42. A lower end of the fuel suction tube 44A penetrates abottom wall portion 38 of a fuel retaining member 36 and the upper facefilter cloth 16U to open inside the fuel filter 16. A fuel ejection tube44B extends upwards from the other side face of the fuel pump body 42 tothe outside of the fuel tank body 14. By driving the fuel pump body 42,fuel can be sucked through the fuel suction tube 44A and supplied to anengine, not illustrated in the drawings, through the fuel ejection tube44B.

Explanation follows regarding operation of the fuel supply device 12 ofthe present exemplary embodiment.

As illustrated in FIG. 1, in a state in which the fuel GS is presentinside the fuel tank body 14 with the fuel surface higher than theinflow hole 24 of the storage member 18, fuel that has flowed in throughthe gap 28 (between the inflow hole 24 and the fuel suction tube 44A) isstored inside the storage member 18. In this state, fuel is also presentinside the fuel filter 16.

When the fuel pump module 32 is driven, as shown by the arrow F0, thefuel inside the fuel filter 16 is fed out to the outside (to an engineor the like) through the fuel suction tube 44A and the fuel ejectiontube 44B. Fuel is able to flow into the fuel filter 16 through the upperface filter cloth 16U (see the arrow F2) and the lower face filter cloth16L (see the arrow F1). Moreover, as shown by the arrow F3, fuel insidethe fuel tank body 14 flows inside the storage member 18 through the gap28.

As illustrated in FIG. 4, in a state in which the amount of fuel insidethe fuel tank body 14 has been depleted, an oil membrane LM of the fuelis formed and maintained on the surface of the fuel filter 16 as long asat least a portion of the fuel filter 16 is immersed in the fuel. In thepresent exemplary embodiment, the fuel filter 16 is disposed along thebottom face 14B of the fuel tank body 14, thereby enabling a contactstate between the fuel and the fuel filter 16 (lower face filter cloth16L) inside the fuel tank body 14 to be more reliably maintained.

Moreover, in the present exemplary embodiment, the upper face filtercloth 16U and the lower face filter cloth 16L are welded together at thewelded portion 16C, placing the upper face filter cloth 16U and thelower face filter cloth 16L in close contact with each other.Accordingly, even when for example the fuel GS is not in contact withthe upper face filter cloth 16U, as long as the fuel GS is in contactwith the lower face filter cloth 16L, the oil membrane LM of the fuel isformed and maintained on the surface of the fuel filter 16.

The liquid surface of the fuel GS inside the fuel tank body 14 sometimestilts, for example during acceleration and turning of the vehicle.During such tilting of the liquid surface, portions of the fuel filter16 to the upper side of the fuel surface are exposed to air inside thefuel tank body 14, however the oil membrane LM on the fuel filter 16surface is maintained as long as a portion to the lower side of theliquid surface is immersed in the fuel. Moreover, as illustrated in FIG.5, even when the surface of the fuel inside the fuel tank body 14 hasreached the lower side of the fuel filter 16, the oil membrane LM of thefuel is formed and maintained on the surface of the fuel filter 16 aslong as a portion of the fuel filter 16 (the upper face filter cloth16U) is in contact with the fuel stored in the storage member 18.

Since the energy required for feeding out the fuel has the relationship(gas suction from gas phase)>(fuel suction from liquid phase) due to thesurface tension of the oil membrane, only fuel is sucked inside the fuelfilter 16. Accordingly in such a state, driving the fuel pump module 32enables the fuel inside the fuel filter 16 to be fed out to the outside.

In the present exemplary embodiment, the sub tank 15 is configuredincluding the sub tank upper side member 15U and the sub tank lower sidemember 15L, and the upper face filter cloth 16U and the lower facefilter cloth 16L are nipped by the upper side nipping wall 30U and thelower side nipping wall 30L. The shape of the fuel filter 16 canaccordingly be stably maintained, and it is possible to stably disposethe fuel filter 16 at a specific position inside the fuel tank body 14.

As can be seen from FIG. 2 and FIG. 3, the nipping position NP of theupper face filter cloth 16U and the lower face filter cloth 16L by theupper side nipping wall 30U and the lower side nipping wall 30L isconfigured at a different position from the welded portion 16C. Loadfrom the sub tank 15 and other external forces act on the nippingposition NP due to external disturbances caused by for example vehiclevibration. However, external forces do not act on the welded portion16C. The weld strength of the welded portion 16C can accordingly bemaintained. The fuel filter 16 can accordingly be configured at lowercost since there is no need for a high weld strength in consideration ofexternal forces acting on the welded portion 16C.

In particular, in the present exemplary embodiment, as seen in plan viewthe nipping position NP is disposed further to the inner side than thewelded portion 16C. Even when forces FA, FB act in directions to movethe upper face filter cloth 16U and the lower face filter cloth 16Lapart from each other, due to the presence of the nipping position NPthese forces FA, FB do not act on the welded portion 16C. Namely, theweld strength of the welded portion 16C can be maintained even withrespect to forces moving the upper face filter cloth 16U and the lowerface filter cloth 16L apart from each other.

Moreover, in the present exemplary embodiment, the nipping position NPand the welded portion 16C are adjacent to each other in plan view. Asshown by the arrow F4 in FIG. 3, even when the fuel GS inside the fuelfilter 16 attempts to penetrate between the upper face filter cloth 16Uand the lower face filter cloth 16L, the space between the upper facefilter cloth 16U and the lower face filter cloth 16L is small at thenipping position NP, reducing the permeability of the fuel. Penetrationof the fuel GS is accordingly suppressed at the nipping position NP. Thespace between the upper face filter cloth 16U and the lower face filtercloth 16L is also small at the welded portion 16C. Accordingly, evenwere a tiny amount of the fuel GS to penetrate between the upper facefilter cloth 16U and the lower face filter cloth 16L, penetration of thefuel GS is again suppressed at the welded portion 16C. Unintentionalleakage due to the fuel GS penetrating between the upper face filtercloth 16U and the lower face filter cloth 16L can accordingly beeffectively suppressed.

Note that put simply, in order to effectively suppress penetration ofthe fuel GS between the upper face filter cloth 16U and the lower facefilter cloth 16L, it is sufficient for the nipping position NP and thewelded portion 16C to be adjacent to each other in plan view. FIG. 6 isan enlarged illustration of the vicinity of the welded portion 16C andthe nipping position NP in a fuel supply device 72 of a modified exampleof the first exemplary embodiment. In the fuel supply device 72 of themodified example, the nipping position NP where the upper side nippingwall 30U and the lower side nipping wall 30L nip the upper face filtercloth 16U and the lower face filter cloth 16L is configured at an outerperipheral portion of the upper face filter cloth 16U and the lower facefilter cloth 16L in plan view. The welded portion 16C is set at theinside of the nipping position NP. Since in this structure the nippingposition NP and the welded portion 16C are again adjacent to each otherin plan view, penetration of the fuel GS from the inside of the fuelfilter 16 can be suppressed at the welded portion 16C, and alsosuppressed at the nipping position NP.

Moreover, in the fuel supply device 72 of the modified example, thenipping position NP is positioned at the outer peripheral portion of theupper face filter cloth 16U and the lower face filter cloth 16L.Accordingly, even when the vertical wall portion 20 of the sub tankupper side member 15U and the welded portion 16C move relatively towardseach other due to for example external disturbances, the force acting onthe welded portion 16C from the vertical wall portion 20 is lessened bythe vertical wall portion 20. The weld strength of the welded portion16C can accordingly be maintained.

FIG. 7 illustrates a sub tank 85 configuring a fuel supply device 82 ofa second exemplary embodiment of the present invention. Note that theoverall configuration of the fuel supply device 82 of the secondexemplary embodiment is similar to that of the fuel supply device 12 ofthe first exemplary embodiment and is therefore omitted fromillustration in the drawings. Configuration elements, members and thelike of the sub tank 85 of the second exemplary embodiment that aresimilar to those of the sub tank 15 of the first exemplary embodimentare allocated the same reference numerals, and detailed explanationthereof is omitted.

In the sub tank 85 of the second exemplary embodiment, a sub tank upperside member 85U and a sub tank lower side member 85L are ofsubstantially the same shape as the sub tank upper side member 15U andthe sub tank lower side member 15L of the first exemplary embodiment.However, the sub tank upper side member 85U and the sub tank lower sidemember 85L are coupled together by a hinge portion 85H provided toportions of the outer peripheries thereof. Due to the hinge portion 85H,the sub tank lower side member 85L rotates with respect to the sub tankupper side member 85U as shown by the arrow R1. On the opposite side tothe hinge portion 85H, an engagement tab 60 of the sub tank lower sidemember 15L engages with an engagement hole 62 of the sub tank upper sidemember 15U (for example by what is referred to as snap fitting).

In particular, in the present exemplary embodiment, the hinge portion85H is configured by a thinned hinge. The sub tank upper side member 15Uand the sub tank lower side member 15L are integrated together by thehinge portion 85H.

The fuel supply device 82 of the second exemplary embodiment configuredin this manner obtains similar operation and advantageous effects tothose of the fuel supply device 12 of the first exemplary embodiment.

Moreover, in the fuel supply device 82 of the second exemplaryembodiment, the sub tank upper side member 85U and the sub tank lowerside member 85L are integrated together, resulting in fewer componentsthan in a configuration employing separate bodies. The number ofassembly processes can be reduced due to integrally molding the sub tankupper side member 85U and the sub tank lower side member 85L together.

Moreover, since portions of the sub tank upper side member 85U and thesub tank lower side member 85L are integrated together in advance, thenipping process of the upper face filter cloth 16U and the lower facefilter cloth 16L can be made easier.

Note that in the present invention, the pressure loss of the upper facefilter cloth 16U and the pressure loss of the lower face filter cloth16L may be the same as each other, however in each of the aboveexemplary embodiments the pressure loss of the lower face filter cloth16L is set lower (smaller) than the pressure loss of the upper facefilter cloth 16U. Since more of the fuel flows inside the fuel filter 16by passing through the lower face filter cloth 16L, a stored state ofthe fuel inside the storage member 18 can be maintained.

There is no limitation of the joint portion of the present invention tothe welded portion 16C described above. Briefly put, it is sufficientfor plural sheets of filter members (the upper face filter cloth 16U andthe lower face filter cloth 16L) to be contiguously joined together. Forexample, the joint portion of the present invention includes examplesconfigured with plural sheets of filter members that are made contiguousto each other by for example adhering or sewing to configure a fuelfilter with an overall bag shape. Moreover, in the present invention, bypositioning the nipping position NP at a different position from thejoint portion, the joint strength of adhered portions or sewn portionscan be maintained when configuration is made with adhered or sewn jointportions.

An example has been given above wherein the fuel filter of the presentinvention is configured by the two members of the upper face filtercloth 16U and the lower face filter cloth 16L. However configuration mayalso be made employing 3 or more filter cloths (filter members). When 3or more filter members are employed, a fuel filter can be formed with anoverall bag shape by joining together the filter members at the jointportion. The filter members configuring the fuel filter should be nippedwith the nipping position set at a different position from the jointportion.

There is no limitation of the nipping members of the present inventionto the upper side nipping wall 30U or the lower side nipping wall 30Lprovided to the sub tank upper side member 15U, 85U (nipping tabs) andthe sub tank lower side member 15L, 85L (nipping tabs). For example,configuration may be made with members that act to maintain the shapeand secure the strength of the fuel filter 16 (plural sheets of filtermembers) simply by nipping the fuel filter 16 from above and below atthe nipping position NP, without configuring the sub tank 15.

In the above explanation, both the upper side nipping wall 30U and thelower side nipping wall 30L are formed in circular cylinder shapes, withthe nipping position NP configured in a ring shape. However the nippingposition of the present invention does not have to be set in a ringshape with respect to the filter members (the upper face filter cloth16U and the lower face filter cloth 16L), and may for example be set inthe shape of a ring with a missing portion, or may be set with anon-continuous shape following the outer periphery of the fuel filter 16(the upper face filter cloth 16U and the lower face filter cloth 16L).

Moreover, the relationship between the storage member 18 and the fuelsuction tube 44A is not limited to the relationship described above. Forexample, configuration may be made with a structure wherein the fuelsuction tube 44A penetrates the lid plate portion 22 at a differentposition from the inflow hole 24 of the lid plate portion 22.

The storage member 18 may be configured such that a portion of the fuelfilter 16 is not covered (wherein a portion of the fuel filter 16 sticksout to the outside of the storage member 18 as viewed from above). Insuch cases, by connecting the fuel suction tube 44A to the sticking outportion of the fuel filter 16 (outer portion of the storage member 18),a structure is possible in which the fuel suction tube 44A does notpenetrate the lid plate portion 22.

In the above explanation, the fuel pump module 32 including the fuelpump body 42 is given as an example of a feed-out means of the presentinvention. However, for example in a configuration in which negativepressure is employed to feed the fuel to the outside of the fuel tankbody 14, the fuel pump body 42 is not required.

1. A fuel supply device comprising: a fuel tank body that stores fuel; afuel filter that is provided inside the fuel tank body and formed in anoverall bag shape with a plurality of sheets of filter memberssuperimposed on each other and joined together by a joint portion so asto permit passage of the fuel and restrict passage of foreign matter inthe fuel; a nipping member that nips the plurality of sheets of filtermembers at a nipping position that is a different position from thejoint portion; a separation maintaining member that is disposed betweenthe plurality of sheets of filter members and that maintains aseparation between the filter members; and a feed-out device that feedsout fuel from inside the fuel filter to the fuel tank body exterior. 2.The fuel supply device of claim 1, wherein: the fuel filter is formed ina flattened bag shape by employing the plurality of sheets of filtermembers disposed from top to bottom, and joining the plurality of sheetsof filter members together with the joint portion set at an outerperipheral portion of the filter members; and the nipping member nipsthe plurality of sheets of filter members in an up-down direction at thenipping position.
 3. The fuel supply device of claim 2, wherein theseparation maintaining member is disposed so as to maintain theseparation between the plurality of sheets of filter members in theup-down direction.
 4. The fuel supply device of claim 1, wherein thejoint portion and the nipping position are adjacent to each other asviewed along the superimposing direction of the plurality of sheets offilter members.
 5. The fuel supply device of claim 1, wherein thenipping position is positioned to an inner side of the joint portion. 6.The fuel supply device of claim 1, wherein the joint portion ispositioned to an inner side of the nipping position.
 7. The fuel supplydevice of claim 1, wherein the nipping member comprises: two nippingtabs that are rotatably coupled to each other by a hinge portion; and anipping maintaining member that maintains a nipping state of theplurality of sheets of filter members by the two nipping tabs.